Reviewed By james b (Ashville, AL) Reviewed for a 2012 GMC Sierra —6/27/2016 2:49 AM
Haven't seen a major power difference but has definitely improved fuel economy. Only problem I've had with it is it has froze up on me twice.
Reviewed By Timothy M (CONCORD, NC) Reviewed for a 2012 GMC Sierra —5/24/2016 1:53 PM
Simply plugged it in and problem solved. No more constant shifting between 25-45 MPH. Dealer told me I would get used to it and I never could. Was considering trading for another brand, even though I love this truck and now it runs like a V8 should.